import re

from rest_framework import serializers

from goods.models import SKU
from users.utils import gengric_verify_url
from .models import User
from django_redis import get_redis_connection
# serializers.ModelSerializer
# serializers.Serializer
class RegisterCreateUserSerializer(serializers.ModelSerializer):

	# 只进行反序列化要求的
	# write_only 只在反序列化 输入的时候起作用
	# 在序列化（对象——>字典）的时候，不起作用

	# read_only只读 ，反序列化不使用
	password2 = serializers.CharField(label='确认密码',write_only=True)
	sms_code = serializers.CharField(label='短信验证码',max_length=6,min_length=6,write_only=True)
	allow = serializers.CharField(label='是否同意协议',write_only=True)

	token = serializers.CharField(label='token',read_only=True)
	# ModelSerializer自动生成字段的时候是根据fields来生成
	class Meta:
		model = User
		fields = ['id','mobile','password','username','sms_code','password2','allow','token']

		extra_kwargs = {
			'id': {'read_only': True},
			'username': {
				'min_length': 5,
				'max_length': 20,
				'error_messages': {
					'min_length': '仅允许5-20个字符的用户名',
					'max_length': '仅允许5-20个字符的用户名',
				}
			},
			'password': {
				'write_only': True,
				'min_length': 8,
				'max_length': 20,
				'error_messages': {
					'min_length': '仅允许8-20个字符的密码',
					'max_length': '仅允许8-20个字符的密码',
				}
			}
		}

		"""
		对数据的验证有 4种方式：
			1.字段校验
			2.字段选项
			3.单字段校验
			4.多字段校验

		校验手机号  单个字段校验
		是否同意协议 单个字段校验

		密码和确认密码  多个字段校验
		短信验证码  多个字段校验

		"""

	def validate_mobile(self,value):

		if not re.match('1[3-9]\d{9}',value):
			raise serializers.ValidationError('手机号规则不正确')

		# 最终校验完成之后,要把值返回回去
		return value
	def validate_allow(self,value):

		if value != 'true':
			raise serializers.ValidationError('您未同意协议')
		return value
	def validate(self,attrs):
		# 密码和确认密码
		password = attrs.get('password')
		password2 = attrs.get('password2')
		sms_code = attrs.get('sms_code')
		mobile = attrs.get('mobile')

		if password2 != password:
			raise serializers.ValidationError('密码不一致')
		# 短信验证码需要

		redis_conn = get_redis_connection('code')

		redis_code = redis_conn.get('sms_%s'%mobile)
		if redis_code is None:
			raise serializers.ValidationError('验证码已过期')
		if redis_code.decode() != sms_code:
			raise serializers.ValidationError('验证码不一致')

		return attrs

	def create(self,validated_data):
		# 系统在调用此方法的时候，validated_data多了用一些字段，应为User模型没有那些字段（password2,allow,sms_code）
		# 我们把validated_data 中的这三个字段删除就可以
		del validated_data['password2']
		del validated_data['allow']
		del validated_data['sms_code']

		user = User.objects.create(**validated_data)

		# 修改密码
		user.set_password(validated_data['password'])

		# 如何生成token,把代码复制到这里！
		from rest_framework_jwt.settings import api_settings
		# 1.我们需要获取rest_framework_jwt的两个方法
		jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
		jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
		# 2.将用户信息给playload,然后进行编码
		payload = jwt_payload_handler(user)
		token = jwt_encode_handler(payload)

		user.token = token
		user.save()

		return user


class UserCenterInfoSerializer(serializers.ModelSerializer):
	class Meta:
		model = User
		fields = ('id','username','mobile','email','email_active')

class UserUpdateEmailSerializer(serializers.ModelSerializer):
	class Meta:
		model = User
		fields = ('email',)

	def update(self, instance, validated_data):

		# 保存邮件内容
		email = validated_data.get('email')
		instance.email = email
		instance.save()

		# 发送激活邮件
		# from django.core.mail import send_mail
		# # subject,message,from_mail,recipient_list,
		# # subject,  主题
		# subject = '美多商城激活邮件'
		# # message,内容
		# message = ''
		# # from_email ， 发件人
		# from_email = '美多商城<13352594723@163.com>'
		# # recipient_list,收件人列表
		# recipient_list = [email]
		#
		# # 我们要生成一个激活的url
		# # http://ip:port/success.html?token=xxxx
		# # token 应该包含 用户的信息
		#
		# verify_url = gengric_verify_url(instance.id,email)
		#
		# # 可以设置 丰富的html
		# html_message = '<p>尊敬的用户您好！</p>' \
         #           '<p>感谢您使用美多商城。</p>' \
         #           '<p>您的邮箱为：%s 。请点击此链接激活您的邮箱：</p>' \
         #           '<p><a href="%s">%s<a></p>' % (email, verify_url, verify_url)
		#
		# send_mail(subject=subject,
		# 		  message=message,
		# 		  from_email=from_email,
		# 		  recipient_list=recipient_list,
		# 		  html_message=html_message)

		from celery_tasks.email.tasks import send_verify_email
		send_verify_email(instance.id,email)

		return instance

from .models import Address
class AddressSerializer(serializers.ModelSerializer):
	province = serializers.StringRelatedField(read_only=True)
	city = serializers.StringRelatedField(read_only=True)
	district = serializers.StringRelatedField(read_only=True)
	province_id = serializers.IntegerField(label='省ID', required=True)
	city_id = serializers.IntegerField(label='市ID', required=True)
	district_id = serializers.IntegerField(label='区ID', required=True)
	mobile = serializers.RegexField(label='手机号', regex=r'^1[3-9]\d{9}$')

	class Meta:
		model = Address
		exclude = ('user', 'is_deleted', 'create_time','update_time')

	def create(self, validated_data):
		"""
		因为我们没有让前端将user_id传递过来，所以我们在进行
		Address.objects.create(**validates_data)的时候，缺少了user
		所以会报错

		"""

		validated_data['user'] = self.context['request'].user

		# return Address.objects.create(**validates_data)
		# super() 会调用 ModelSerializer 的create方法
		return super().create(validated_data)

class UserHistorySerializer(serializers.ModelSerializer):

	sku_id = serializers.CharField(label='商品id',required=True)

	class Meta:
		model = SKU
		fields=['sku_id']

	def validate(self, attrs):

		# 判断商品id是否存在

		sku_id = attrs.get('sku_id')
		try:
			sku = SKU.objects.get(pk=sku_id)
		except Exception:
			raise serializers.ValidationError('商品不存在')

		return attrs

class SKUSerializer(serializers.ModelSerializer):

	class Meta:
		model = SKU
		fields = ('id', 'name', 'price', 'default_image_url', 'comments')
